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Mohan gets 3 marks for each correct sum ...

Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is :

A

10

B

15

C

20

D

25

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AI Generated Solution

The correct Answer is:
To solve the problem, we need to set up equations based on the information given. Let's break it down step by step. ### Step 1: Define Variables Let: - \( x \) = number of correct sums solved by Mohan - \( y \) = number of wrong sums solved by Mohan
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ARIHANT SSC-FUNDAMENTALS -EXERCISE - MISCELLANEOUS
  1. Simplified value of (8.73 xx 8.73 xx 8.73 + 4.27 xx 4.27 xx 4.27)/(8.7...

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  2. If (x - 1/x) = 5, then x^3 - 1/(x^3) equals :

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  3. Mohan gets 3 marks for each correct sum and loses 2 marks for each wro...

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  4. |x-1|+|x-2|+|x-3| ge 6

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  5. It costs Rs. 10 a kilometer to fly and Rs. 2 a km to drive. If one tra...

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  6. If 2^(x + 3) . 4^(2x - 5) = 2^(3x + 7) , then the value of x is :

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  7. The value ((x^a)/(x^b))^((a^2 + ab + b^2)) ((x^b)/(x^c))^((b^2 + bc + ...

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  8. The value of 4 xx 100 + 3 xx 10 + 9/1000 is:

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  9. Which one of the following statement is correct?

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  10. The least number which is a perfect square and has 540 as a factor is ...

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  11. The set of netural numbers is closed under the binary operations of :

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  12. If (100 sqrt(25))/(sqrt(25) + x) = 50 then the value of x is :

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  13. The total number of prime number between 120 and 140 is :

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  14. The number 12375 is divisible by :

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  15. (1 - 1/3) (1 - 1/4)(1 - 1/5)………(1 - 1/n) equals:

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  16. If x/2 = y/3, then [4/5 + (y - x)/(y+x)] equals :

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  17. The value of ((119)^2 + (119)(111) + (111)^2)/((119)^3 - (111)^3) is :

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  18. A number consists of two digits. The sum of the digits is 11, reversin...

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  19. For a journey the cost of a child ticket is 1/3 rd of the cost of an a...

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  20. 9^(3//2) div (243)^(-2//3) simplifies to :

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